For me and my partner i think it was the most emotional Erp we had in our lifes
It was about his character being like an android builder that had a successful company, made a lot of money and stuff, but when that was happening her wife died and didn't manage to have children, so he creates in his basement the most advance model possible by him alone, An android (My character) that looked similar to her wife, Although it didn't had the memories of her, so he starts training the android AI by acting just like when her wife was alive, and after some time it starts acting now like her wife, and one day the android asks out of nowhere if he wants to have a kid, the man has sex with her and after that, the android acts like expecting a baby, even though nothing is really happening inside her body, this keeps going and going until 9 months passes and someone knocks on the door, there was nobody aside from a baby in a basket and at that moment the android comes up and grabs the baby and says "I made it, our son is here" but at the end she just adopted a baby and tried to make it a surprise and the fact that she searched the most identical baby possible to match up, hair, skin, eyes and even blood type
It basically ends when the kid turns 18 years old and by that moment the android is 99% human like, she no longer acts like a robot following orders, because she now dosen't have anyone to give her orders, the man killed himself one day after the baby entered the house
Sorry for make it long